Hydraulic Roller - Xtreme Marine: Good for jet boat with A or B impeller, strong mid-range power, needs good exhaust.; 276/282 Advertised Duration, 224/230 Duration .050", .503"/.510" Lift, 112 Lobe Separation; 1500 to 5500 RPM range; Valve spring upgrade required; Must use bronze tip fuel pump pushrod when using high pressure or high volume pump
